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Substrates > Aluminium-Zinc Coated Steel

Aluminium-Zinc Coated Steel

Aluzinc, Zincalume and Galvalume are different trade names of this product. Aluzinc is cold rolled galvanized steel with metal coating composed of Aluminium (55%), Zinc (43,4%) and Slicium (1,6%).

It is formable, weldable and readily accepts paint finishes. Aluzinc coated steel has superior long term corrosion resistance in most atmospheric conditions. This is achieved through the combination of the sacrificial protection of the zinc and the barrier protection of the aluminium.

Corrosion rates vary according to the severity of conditions, producers of Aluzinc steel coatings claim it can out-perform galvanized coatings from 2 - 6 times.

The protective mechanism for Aluzinc and hot-dip-galvanized steel are such that the hot-dip-galvanized coating initially protects better but the zinc coat will gradually corrode away more and more in the vicinity of the edge and the protective effect will be lost.

Then the aluminium part of the Aluzinc coating will persist for a longer period of time, and the protection will thereby remain.